package com.util;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;

public class CharacterEncodingFilter implements Filter {

	protected String encoding = null;
    protected FilterConfig filterConfig = null;
    protected boolean ignore = true;
    
	public void destroy() {
		this.encoding = null;
        this.filterConfig = null;
	}

	
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		 // Conditionally select and set the character encoding to be used
        if (ignore || (request.getCharacterEncoding() == null)) {
            String encoding = selectEncoding(request);
            if (encoding != null)
                request.setCharacterEncoding(encoding);
        }
        // Pass control on to the next filter
        
		chain.doFilter(request, response);
	}

	
	public void init(FilterConfig fConfig) throws ServletException {
		 	this.filterConfig = fConfig;
	        this.encoding = filterConfig.getInitParameter("encoding");
	        String value = filterConfig.getInitParameter("ignore");
	        if (value == null)
	            this.ignore = true;
	        else if (value.equalsIgnoreCase("true"))
	            this.ignore = true;
	        else if (value.equalsIgnoreCase("yes"))
	            this.ignore = true;
	        else
	            this.ignore = false;
	}

	protected String selectEncoding(ServletRequest request) {
        return (this.encoding);
    }
}
